Having the blues is a phrase used to describe a feeling of sadness or depression. It is often associated with a type of music known as the blues, which originated in the African-American communities of the southern United States in the late 19th and early 20th centuries. The term 'having the blues' is used to describe a person who is feeling down or depressed. The crossword solution for this term is SAD, which is an acronym for 'sadness, anxiety, and depression'.